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      1 /* $NetBSD: resetbtn.c,v 1.2 2024/01/23 21:56:07 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2024 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: resetbtn.c,v 1.2 2024/01/23 21:56:07 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 #include <sys/systm.h>
     36 #include <sys/reboot.h>
     37 #include <powerpc/pio.h>
     38 #include <dev/sysmon/sysmonvar.h>
     39 #include <dev/sysmon/sysmon_taskq.h>
     40 
     41 #include "hollywood.h"
     42 
     43 #define	PI_INTERRUPT_CAUSE	0x0c003000
     44 #define	 RESET_SWITCH_STATE	__BIT(16)
     45 
     46 static int	resetbtn_match(device_t, cfdata_t, void *);
     47 static void	resetbtn_attach(device_t, device_t, void *);
     48 
     49 static int	resetbtn_intr(void *);
     50 static void	resetbtn_task(void *);
     51 
     52 CFATTACH_DECL_NEW(resetbtn, sizeof(struct sysmon_pswitch),
     53 	resetbtn_match, resetbtn_attach, NULL, NULL);
     54 
     55 static int
     56 resetbtn_match(device_t parent, cfdata_t cf, void *aux)
     57 {
     58 	return 1;
     59 }
     60 
     61 static void
     62 resetbtn_attach(device_t parent, device_t self, void *aux)
     63 {
     64 	struct hollywood_attach_args *haa = aux;
     65 	struct sysmon_pswitch *smpsw = device_private(self);
     66 	int error;
     67 
     68 	KASSERT(device_unit(self) == 0);
     69 
     70 	aprint_naive("\n");
     71 	aprint_normal(": Reset button\n");
     72 
     73 	sysmon_task_queue_init();
     74 
     75 	smpsw->smpsw_name = device_xname(self);
     76 	smpsw->smpsw_type = PSWITCH_TYPE_RESET;
     77 	error = sysmon_pswitch_register(smpsw);
     78 	if (error != 0) {
     79 		aprint_error_dev(self,
     80 		    "unable to register reset button with sysmon: %d\n", error);
     81 		smpsw = NULL;
     82 	}
     83 
     84 	hollywood_intr_establish(haa->haa_irq, IPL_HIGH, resetbtn_intr, smpsw,
     85 	    device_xname(self));
     86 }
     87 
     88 static int
     89 resetbtn_intr(void *arg)
     90 {
     91 	struct sysmon_pswitch *smpsw = arg;
     92 
     93 	sysmon_task_queue_sched(0, resetbtn_task, smpsw);
     94 
     95 	return 1;
     96 }
     97 
     98 static void
     99 resetbtn_task(void *arg)
    100 {
    101 	struct sysmon_pswitch *smpsw = arg;
    102 	bool pressed;
    103 
    104 	pressed = (in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0;
    105 
    106 	if (smpsw != NULL) {
    107 		sysmon_pswitch_event(smpsw,
    108 		    pressed ? PSWITCH_EVENT_PRESSED : PSWITCH_EVENT_RELEASED);
    109 	} else if (!pressed) {
    110 		kern_reboot(0, NULL);
    111 	}
    112 }
    113